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Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Earn-out Payments (Details) $ in Millions | Mar. 31, 2018 USD ($) acquisition | Dec. 31, 2017 USD ($) acquisition
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Summary of Earn-out Payments [Line Items] |  |
Number Of Acquisitions Subject To Potential Earn Out Payments Provisions | acquisition | 56 | 56
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 434.6 | $ 436.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Summary of Earn-out Payments [Line Items] |  |
Earn-out Liabilities, Short-Term | 45.5 | 49.6
Earn-out Liabilities, Long-Term | $ 174.8 | $ 177.5

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- Definition Earn-out Liabilities, Long-Term + References No definition available. + Details
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- Definition Earn-out Liabilities, Short-Term + References No definition available. + Details
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- Definition The number of acquisitions subject to potential earn-out payment provisions. + References No definition available. + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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